Firepot



mil 7, 1936.

c. J. MCJIR 2,036,599

FIREPOT Filed June 7, 1953' 2 Sheets-Sheet l I INVENTOR.

3 Z8 16 15 M A T'ORNEYS.

C. J. MOIR prifl 7, 1936.

FIREPOT Filed June 7, 1933 2 Sheets-Sheet 2 h Eiillliiil Patented Apr. 7, 1936 UNITED STATES PATENT OFFICE FIREPOT Application June 7, 1933, Serial No. 674,604

4 Claims. (Cl. 126-145) This invention relates'to firepots intended to be placed within the firebox of coal burning furnaces, stoves, heaters and the like in order to improve the emciency. of combustion of the coal. It is an object of the present invention to provide a firepot which maybe readily adapted for insertion in furnaces of different sizes, and one which when installed shall be capable of efficient and convenient operation.

Other objects and advantages of the invention will appear hereinafter.

A preferred embodiment of the invention selected for purposes of illustration is shown'in the accompanying drawings, in'which,

Figure 1 isa top plan View.

Figure 2 is a front elevation.

Figure 3 is a top plan view showing the side sections in a different position of adjustment from that illustrated in Figure 1.

Figure 4 is a section on the line 4-4 of Figure 3.

Referring to the drawings, the apparatus comprises generally a plurality of side sections I, a supporting ring 2, a member 3 in the nature of a grate adapted to support the fuel bed from beneath, and supporting legs 4.

Each of the side sections I is preferably cast in a single piece and comprises a curved upper segment 5 and a curved lower segment 6, the said segments being connected by bars I spaced to permit ingress and egress of air and gas. The upper segments may also be provided with lugs 5 which space the segment from the wall of the firebox in order to permit air and gas to pass therebetween. The said bars are preferably substantially triangular in cross section, the bases of the triangles forming the inside of the firepot. The lower segment 6 of each side section is pro- Vided with a rearwardly extending flange I, and the said flange is provided with a plurality of circumferential slots 8 by means of which the side sections may be firmly secured to the supporting ring 2 as hereinafter described.

The supporting ring is preferably cast in two segments, for convenience in installation, and the upper surface 9 of the ring is provided with circumferential corrugations to receive the circumferential ridge I0, substantially V-shaped in cross section, which projects from the lower face of each of the segments 6 in order that the side sections I may be firmly seated on the ring 2. The side sections I may be conveniently secured to the ring 2 by means of bolts II which pass through the slots 8 in the flange I and through the slots I2 in the ring. As will be observed, the

slots I2 are arranged radially and are spaced at frequent intervals in order that the side sections may be adjusted to fit fireboxes of difierent sizes, the slots 8 being of a length sufficient to permit at least one of the said slots of each side 5 section to register with at least one of the slots I2 in any position of the side section on the ring.

The lower surface of the flange I is also bevelled upwardly and outwardly as at I3 in order that when the bolts I I are tightened to fasten the side section to the ring, the upper segment of the side section will be drawn outwardly against the side wall of the firebox and will be held firmly thereagainst.

Acomparison of Figures 1 and 3 will illustrate the adjustability of the firepot for fireboxes of difierent sizes. In Figure l the side sections are adjusted to fit a firebox of medium size, while in Figure 3 the side sections are adjusted to fit a firebox of smaller size. In all cases, side sections of standard size and shape are used, but it will be observed that in Figure 1, nine side sections are employed while in Figure 3, due to the smaller size, only eight side sections are employed. In the case of a firebox of intermediate size, that is, between the adjustments illustrated in Figures 1 and 3 respectively, a section of sufficient length to complete the circle may be cut from a standard side section. In this manner furnaces of all sizes may be accurately fitted. 30

The grate member 3 is preferably substantially cone-shaped and is provided with a pair of supporting trunnions I4 and I5, one of which may be provided with a squared end I6 adapted to receive a shaking tool. The said trunnions are 35 received and supported by brackets l1 and I8 respectively, which said brackets may be conveniently secured to the under side of the ring 2 by means of bolts passed through slots I2. The said brackets I1 and I8 are substantially U-shaped, with the legs of the U spaced apart sufficiently to permit the trunnions to slide sidewise therein in order that the grate may be oscillated about its vertical axis in order to shake the fire.

In order that the said oscillation of the grate may be especially effective to shake the fire, the said grate is provided with a plurality of radial flanges I 9 which project upwardly from its upper surface and extend outwardly somewhat from the periphery of the grate into close proximity to the vertical flange 20 of the ring 2. As the grate is oscillated, these flanges I9 stir the bottom of the fuel bed, particularly at the outer edges thereof where ashes accumulate and. serve to break up the ash in order that it may pass through the space between the grate member and the flange 20.

Ordinarily, such shaking of the grate member 3 is sufiicient for firing purposes, but if desired, in order to remove clinkers and the like, the grate member may be tilted on its trunnions, as illustrated in Figure 4.

In the operation of a firepot of this type, it has been found to be desirable to admit air for combustion purposes chiefly at the sides of the fuel bed through the spaces between bars I, for rea= sons set forth in my copending application Serial No. 615,809, filed June '7, 1932. Accordingly, the grate member is imperforate throughout, except near its periphery, where, if desired, holes 2| may be provided, in order to admit a small quantity of air at the lowest point of the fuel bed.

The firepot may be supported in the furnace in any convenient manner, and in the preferred or ibodiment illustrated the supports comprise legs 22 having serrations 23 on one side to cooperate with V-shaped ridges 23 on cross bars 24. The said cross bars may be secured to the said legs by bolts 25 passing through slot 25 in the cross bar and slot 21 in the leg. The cross bar is adjusted to a position to support the ring from beneath.

It will be understood that the invention may be variously modified and embodied within the scope of the sub-joined claims.

I claim as my invention:

1. A firepot comprising a plurality of side sections, each section comprising an upper segment, a lower segment and spaced bars between thesegments, said lower segment having a flange extending rearwardly, and a ridge depending from the lower face, said flange being provided with circumferential slots, a ring supportin said side sections, said ring being provided with a plurality of radial slots, and having its upper surface corrugated to engage said ridge, and bolts passing through said slots to secure said side sections to said ring in various positions.

2. A firepot comprising a plurality of side sections, each section comprising an upper segment, a lower segment and spaced bars between the segments, said lower segment having flange extending rearwardly, said flange being provided with circumferential slots, 2. ring supporting said side sections, said ring being provided with a plurality of radial slots, and bolts passing through said slots to secure said side sections to said ring in various positions.

3. A firepot comprising, a plurality of side sections, a ring for supporting said side sections, said ring being provided with a plurality of radial slots, said side sections being provided with a plurality of circumferential slots of a length sufficient so that at least one of said circumferential slots of each side section registers with at least one of said radial slots in any position of adjustment on said ring, and bolts passing through said slots to secure said side sections to said ring in various positions.

4. A firepot comprising, a plurality of side sections, a ring for supporting said side sections, said ring being provided with a plurality of radial slots, said side sections being provided with a plurality of circumferential slots, and bolts passing through said slots to secure said side sections to said ring in various positions.

CHARLES J. MOIR. 

